Safety mechanism for elevators.



F.. TURNER. SAFETY MECHANISM FOR ELEVATORS.

APPLICATION FILED DEC. 20, 916.

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3 SHEET$SHEET 2 ATTORNEY F. E. TURNER.

SAFETY MECHANISM FOR ELEVATORS.

APPLICATION FILED DEC. 20 1916.

F. E. TURNER.

SAFETY MECHANiSM FOR ELEVATORS.

APPLICATOYN FILED DEC. 20. I916 3 SHEETS-SHEET Eh INVEN TOR. fi emewm f. W/W/Vfi/t A TTO RN)? 1/ til ""NITED srarifis PATENT OFFICE.

FREDERICK E. TURNER, OF KANSAS CITY, MISSOURI. ASSIGNOR T KANSAS CITY ELEVATOR MANUFACTURING COMPANY,

PURAIION OF MISSOURI.

OF KANSAS CITY, MISSOURI, A. COR- SAFETY MECHANISM FOR ELEVATORS.

Application filed December 20,1916.

To alt whom it may concern:

Be it known that I, FREDERICK E. TURNER, a citizen of the United States, residing at Kansas City, in the county of Jackson and ("State of Missouri, have inventedcertain new and useful Improvements in Safety Mechanism for Elevators; and I do declare the following to be a full, clear, and exact description of the invention, such. as will enable others skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to the letters and figures of reference marked; thereon, which form a part of this specification.

My invention relates to safety mechanism for elevators and more particularly for elevators of thecorner lift type, theprincipal object of the invention being to, utilize the unequal strainloccasioned by breakage ofone of the supporting cables for actuating the safety mechanism.

It. is also anobject of the invention to effect operation of the safety mechanism from a governor, whereby descent of the elevator may be interruptedshould it travel beyond a predetermined speed.

In accomplishingthese objects I have provided improveddetails, of structure, the pre ferred forms of which areillustrated in the accompanying drawings, wherein Figure I is an inverted perspectlve view of" an elevator platform, illustrating the safety mechanism.

I ig. II is a side view ofthe platform and the safety mechanism.

Fig, III is a longitudinal, vertical section ofthe same.

Fig. IV' is. an end. view trip mechanism.

lliig v is a transverse section on the line of the platform v -v, Fig. ii.

Fig. VI is a transversesection on the line VI VI, F II, particularly illustrating the governor mechanism.

Fig. VII is adetailview of a guide block and clutch.

Fig, VIIIis a section on the line VIII VIII, Fig. VII, particularly illustrating the mounting of the clutch shaft on the guide Specification of Letters Patent.

Patented Dec. 11, 1917.. Serial No. 1311079.

' Fig. IX isa detail perspective viewof one of the trip levers. i

Fig. X is a detail perspective view of one of the clutch and guide sets.

Fig. XI is a detail perspective view of the governor control lever.

Referring more in detail to the drawings:

1 designates an elevator platform which may be of ordinary wood or metal construction,co1nprisingend beams 2-2, side beams 3-3 and a floor hand which is suspended.

etween corner guide posts 5 in the elevator shaft by cables 6 that hang from a suitable winding mechanism (not shown).

Secured to the under side of the platform, near the ends and center thereof, are cross beams 77-7 anism, presently described, is mounted and fixed to the outer ends of the beams 7 and 7. are blocks 8, comprising spaced flanges 99 formingoutwardly opening channels 10 for slid ably receiving the guide posts 5.

Extending between opposite blocks 8 at each endofl the platform and journaled at its ends in spaced wings 11-11" formed integrally with each of the blocks, is a cross shaft 12 andlmo-unted' on said shafts between the Wings of the blocks are clutch members 13 VII, VIII andlX) each of which has a tooth l-ladapted, when its member 13 is turned, to projectiinwardly through a slot 15 in the adjacent flange 9 to engage the guide posts 5 and effect a seat thereon to stop the platform in its descent;

In the present device/the shafts 12 are preferably square in cross section to effect a substantial mounting for the grip members and are seated at their ends in collars 1.6 which in turn are revolubly mounted. in theblcck flanges 1l-11 at opposite sides of the clutch members 13.

Pivotally mounted in brackets 1.7 at opposite corners of the. platform, adjacent the guide. blocks 8, are crank levers 18 (Fig. IXyeach of which comprises a downwardly extending arm 18 and an outwardly extending arm 18", the arms 18 of eachofthe opposite end pairs of levers being connected. by crossbars 20to hold the arms 18in substantially horizontal position, the horizonal arms 18 being provided with seats on which the clutch n1ech 21 adjacent their outer ends for receiving bolts :22 which extend upwardly through the floor of the platform and are provided, at their upper ends with eyes 23 to which the supporting cables 6 areattached.

Mounted longitudinally beneath the center of the platform to overlie the cross bars 29 and revolubly supported at its ends and at an intermediate point in bearings 26is a shaft 27. Mounted on said shaft adjacent its ends, are laterally directed rocker arms 28, each providedat its free end with a roller 29 (Fig. V) which rides on a rocker plate 30 ona relative cross bar 20, Each of the rocker plates comprises spaced and oppositely inclined faces 3131, one of which will engage a roller 29 upon movement of the rocker plate in either direction and cause the arm 28 to be raised at its outer end to partially revolve the shaft 27.

' Also mounted at each end of the shaft 27 is a laterally extending arm 33 the outer end of which is adapted to underlie the outer end of a. rocker bar 34 on the adjacent clutch connecting shaft 12. The inner ends 35 of the bars 34 extend beyond the clutch shafts and attached to said ends and to the under side of the platform 2 are coil springs 36 whereby the clutch shafts are yieldingly held in such position that the clutches thereon are yieldingly held away from and do not engage the guide posts 5.

By so constructing the rocker levers, it will be seen that the platform is held in balanced suspension by the supporting cables and that should any one of the cables break, the tension of the opposite cable will cause the crank lever to be rocked in its mounting and the cross bar 20 moved toward one side of the platform, movement of the cross shaft in either direction causing an inclined face of the rocker plate to engage the roller 29 to raise the arm 28 and cause a partial revolution of the longitudinalshaft 27.

Revolution of the shaft 27 causes the outer ends of the arms 33 to engage the bars on the clutch shafts 12 so that the bars are raised to rock said shafts, forcing the teeth of the clutch members to grip the guide posts 5 and stop the platform.

Pivotally-mounted at one end of the center cross plate 7' is a crank lever 40 (Fig. VI) having an outwardly extending arm 41 and a downwardly extended arm 42, and connected with the lower end of the arm 42 and with an arm 43 on the shaft 27 is a link 45 whereby rocking of the crank lever will cause a rotation of the shaft 27 to effect a grip on the guide rails as previously described.

Attached to the arm 11 is-a cable 46 which extends upwardly and about a governor drum 17. in such a manner that as the car descends'the drum is revolved; the governor arms 48 being so arranged that excessive speed will cause the latter to spread suiiiciently to engage stops 4&9 to interrupt movement of the governor.

Presuming the governor to be so attached, should the platform arms drop suddenly, the governor arms will be thrown outwardly to engage the steps 49 to step movement of the drum 47, causing a sudden tension on the cable 46 which will rock the crank lever 4-0 and revolve the shaft 27, in this manner throwing the clutches to prevent a further fall of the platform.

By so constructing the parts it will be seen that should any one of the cables break, or should an operator lose control of the hoisting motor, so that the elevator might drop suddenly, all the clutches will be automatically and simultaneously thrown to grip the guides and prevent the elevator from falling, and that the elevator platform may be supported by the guides and clutches until properly repaired or controlled.

Having thus described my invention what I claim as new therein and desire to secure by Letters-Patent, is:

1. The combination with an elevator platform, of paired rocker members on the platform, a link connecting said rocker members, cables connected with the rocker members to support the platform, paired clutch members on the platform, a shaft operably connected with said clutch members, a rock shaft, means on the connecting link for actuating the rock shaft, and means operable by the rock shaft for actuating the clutch shaft.

2. The combination with an elevator platform, of paired rocker members on the platform, a link connecting said rocker members, cables connected with the rocker members to support the platform, paired clutch members on the platform, a shaft operably connected with said clutch members, a rock shaft, a cam on the connecting link, means operable by the cam for actuating the rock shaft, and means operable by the rock shaft for actuating the clutch shaft.

3. The combination with an elevator platform, of paired rocker members on the platform, a link connecting said rocker members, cables connected with the rocker members to support the platform, paired clutch members on the platform, a shaft operably connected with said clutch members, a rock shaft, a cam on the connecting link, means operable by the cam for actuating the rock shaft, a rock bar on the clutch shaft, and means on the rock shaft for actuating said rock bar.

4. The combination with an elevator platform, of paired rocker members on the platform, a link connecting said rocker members, cables connected with the rocker members to support the platform, paired clutch members on the platform, a shaft lid ltd

nperably connected with said clutch members, a rock shaft, a cam on the connecting link, means operable by the cam for actuating the rock shaft, arock bar on the clutch shaft, means on the rock shaft for actuating said rock bar, and yielding means for holding the clutch shaft in idle position.

5. The combination With an elevator platform, of paired rocker members on the platform, a link connecting said rocker members, cables connected With the rocker members to support the platform, paired clutch members on the platform, a shaft operably connected With said clutch members, a rock shaft, a cam on the connecting link, means operable by the cam for actuating the rock shaft, a rock bar on the clutch shaft extending from opposite sides of the clutch shaft, an arm on the rock shaft for engaging one end of said rock bar, and a spring connected With the opposite end of the bar to yieldingly retain the clutch shaft in idle position.

6. The combination with an elevator plat form, of paired rocker members at opposite sides of the platform, a link connecting said rocker members, cables connected With the rocker members to support the platform, paired clutch members at opposite sides of topics at this patent may be obtained for live cents each, by addressing the the platform operable independently of the rocker members, a shaft operably connected With said clutch members, a rocker shaft arranged transversely of the connecting link and clutch shaft, means on the connecting link and rock shaft for rotating the shaft upon longitudinal movement of the link and means on the rock shaft and clutch shaft for rotating the clutch shaft upon rotary movement of the rock shaft, for the purpose set forth.

7. The combination With an elevator plat form, of paired rocker members at opposite sides of the platform, transverse connecting links connecting the rocker members, cables connected with the rocker members to support the platform, paired clutch members at the opposite sides of the platform, a shaft operably conneeting said clutch members, a rock shaft extending longitudinally relative to the platform, means on the rock shaft and link for rotating the rock shaft upon longitudinal movement of the link, an arm on the clutch shaft and an arm on the rock shaft for engaging the clutch shaft arm to rock the latter upon movement of the former.

In testimony whereof I aflix my signature.

FREDERICK E. TURNER.

Commissioner 0! Patents,

Washington, D. 0." 

